视频速率(喜欢/不喜欢/noe）使用谷歌api php客户端

我正在开发一个脚本，用于使用谷歌api php客户端对视频进行评级。当它执行时，Google API会回复我：｛"data"，null｝而不会发生其他任何事情。

所以，我不知道我的代码是不是错了。这里有一个使用Google_Service_Youtube对视频进行评分的例子：

// SCRIPT FOR RATING A YOUTUBE VIDEO
// Trying to rate for this video: https://www.youtube.com/watch?v=ZE8ODPL2VPI
require_once realpath(dirname(__FILE__) . '/../autoload.php');
// API GOOGLE CLIENT PARAMS
$client_id  = 'SET_CLIENT_ID_GOOGLE_API';
$client_secret  = 'SET_CLIENT_SECRET_GOOGLE_API';
$redirect_uri   = 'SET_REDIRECT_URI_GOOGLE_API';
// ID VIDEO FOR RATING
$id_video   = 'ZE8ODPL2VPI';
$rating     = 'like'; // Acceptable values: dislike, like, none
// LOCAL SCRIPT PARAMS    
$is_auth    = false;
// REQUEST (POST|GET) PARAMS
$idvideo    = null; 
$rating     = null;
$code       = null;
if(isset($_POST["idvideo"])) $idvideo = $_POST["idvideo"];
if(isset($_POST["rating"])) $rating = $_POST["rating"];
if(isset($_GET["code"])) $code = $_GET["code"];
$client = new Google_Client();
$client->setClientId($client_id);
$client->setClientSecret($client_secret);
$client->setRedirectUri($redirect_uri);
$client->setScopes("https://www.googleapis.com/auth/youtube"); 
if(isset($_SESSION['youtube_data']) && !empty($_SESSION['youtube_data'])) 
      $is_auth = true;  
if($is_auth){
    $token = $_SESSION['youtube_data'];
    $client->setAccessToken($token);
    if($idvideo != null && $rating != null){
        $youtube = new Google_Service_YouTube($client);
        $result = $youtube->videos->rate($idvideo,$rating);
        echo $result;
    }else{
        echo '
        <form action="rating_video.php" method="POST">
            <input type="hidden" name="rating" value="'.$rating.'" /> 
            <input type="hidden" name="idvideo" value="'.$id_video.'" />
            <button type="submit">I like: '.$id_video.'</button>
        </form>';
    }
}else{  
    if($code != null){      
        $client->authenticate($code);
        $_SESSION['youtube_data'] = $client->getAccessToken();
        $redirect = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
        header('Location: ' . filter_var($redirect, FILTER_SANITIZE_URL));
    }else{
        $authUrl = $client->createAuthUrl();            
        echo "<a href='$authUrl'>Sign in with Google </a>";     
    }
}